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   <title>OpenSLP Users Guide - When To Run slpd</title>
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<h2>When To Run slpd<br />
<span id="breadcrumbs"><a href="index.html">OpenSLP User's Guide</a> &raquo; Advanced Topics &raquo; <a href="WhenToRunSlpd.html">When To Run slpd</a></span></h2>

<p><tt>slpd</tt> provides SA (and possibly DA) functionality along with the 
ability to maintain a consistent state with respect to the locations of other 
SLP agents on the network.&nbsp; The SLP library (<tt>libslp.so</tt>) provides 
UA functionality internally on a per process basis with out the need to 
communicate with slpd. This means that in certain cases, the slp daemon does not 
always have to be loaded on every machine.&nbsp; We're not sure if this will be 
a valuable feature to a majority of users, but at least it offers the additional 
flexibility to minimize the overhead for SLP for those machines that will only 
need UA capabilities.&nbsp; (If you're wondering about the meaning of DA, SA, 
and UA, you should probably read
<a href="../IntroductionToSLP/index.html">An Introduction to SLP</a>).</p>

<h3>When is slpd needed?</h3>

<ul>
<li>
slpd must be running on all machines that will be registering services.&nbsp; In 
other words, slpd is required on all machines that run applications that make 
calls to one of the following SLP APIs <tt>SLPReg()</tt>,
<tt>SLPDeReg()</tt>, or <tt>SLPDelAttrs().&nbsp; </tt><a href="../ProgrammersGuide/index.html">
See the OpenSLP Programmers Guide for details.</a></li>

<li>
slpd is the process that maintains static registrations from the /etc/slp.reg 
file.&nbsp; If you expect the registrations for this file to be available to other 
machines, you must run slpd.</li>

<li>
slpd is required for automatic DA and scope discovery to work correctly.&nbsp; If you 
do not run slpd, then DAs and scopes can only be discovered via DHCP or the <tt><a href="SlpConf.html">
/etc/slp.conf</a></tt> file. (Note: Due to a lack of a standard DHCP API DA 
discovery via DHCP is not yet supported).</li>
</ul>

<h3>When is slpd not needed?</h3>

<ul>
<li>
slpd is not needed if a machine will only be requesting services.&nbsp; In other 
words, slpd is not required on machines if a call will never be made to <tt>
SLPReg()</tt>, <tt>SLPDeReg()</tt>, or <tt>SLPDelAttrs().</tt></li>

<li>
slpd is not needed on a machine if manual or DHCP DA or scope discovery is 
sufficient.</li>
</ul>

<p id="breadcrumbs0">Prepared by: <a href="http://www.calderasystems.com">Caldera Systems Inc</a><br />
Maintained by: <a href="http://www.openslp.org/">openslp.org</a></p>

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